The hydrothermal reactions of divalent metal salts with 4-HOOC–C₆H₄–CH₂–NH₂CH₂PO₃H₂ (H₃L) led to four Metal-organic phosphonates (MOPs), namely, Ni(HL)(H₂O)₂ (1), Cd(HL) (2), CdCl(H₂L) (3), and Pb_1.5Cl₂(H₂L) (4). All these compounds exhibited 2D layer substructures with various features based on metal centers and –PO₃ groups of the ligands. Differently, the layers cross-linked each other in compounds 1 and 4 via hydrogen bonds generating 3D supramolecular frameworks. While in compounds 2 and 3, they were connected by carboxylate group of the ligands to form 3D pillared-layer frameworks. Such differences were related to the coordination mode of the metal centers, and the pH of the reaction system also played a important role on the coordination ability of the ligands. The magnetic properties reveal the presence of ferromagnetic interactions in compound 1 through a Ni–O–P–O–Ni five-member chain. Luminescent measurements indicate that compounds 2–4 each displays strong blue fluorescent emissions.

二价金属盐与4-HOOC-C ₆ H ₄ -CH ₂ -NH ₂ CH ₂ PO ₃ H ₂（H ₃ L）的水热反应产生了四个金属有机膦酸酯（MOP），即Ni（HL） （H ₂ O）₂（1），Cd（HL）（2），CdCl（H ₂ L）（3）和Pb _1.5 Cl ₂（H ₂ L）（4）。所有这些化合物均基于金属中心和配体的-PO ₃基团表现出具有各种特征的2D层亚结构。不同的是，这些层之间通过化合物1和4相互交联氢键生成3D超分子框架。而在化合物2和3中，它们通过配体的羧基连接形成3D柱状骨架。这些差异与金属中心的配位方式有关，反应体系的pH值对配体的配位能力也起重要作用。磁性表明通过Ni–O–P–O–Ni五元链存在化合物1中的铁磁相互作用。发光测量表明，化合物2-4均显示出强烈的蓝色荧光发射。